Load distribution for paging initiated UL access
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
IEEE C802.16m-08/1208
Date Submitted:
2008-09-15
Source:
Haihong Zheng, Xiaoyi Wang, Shashikant Maheshwari, Yousuf Saifullah
Nokia Siemens Networks
Zexian Li, Andrea Baccioccola
Nokia
Email:
haihong.zheng@nsn.com
Zexian.li@nokia.com
Venue:
Re: MAC:Idle Mode; As reply to Idle Mode AHG SDD Text proposal C80216m-08/1128r1
Base Contribution:
This is the base contribution.
Purpose:
Discuss and adopt
Notice:
This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It represents only the views of the participants listed in
the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material
contained herein.
Release:
The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an
IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s
sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this
contribution may be made public by IEEE 802.16.
Patent Policy:
The contributor is familiar with the IEEE-SA Patent Policy and Procedures:
<http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and <http://standards.ieee.org/guides/opman/sect6.html#6.3>.
Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and <http://standards.ieee.org/board/pat >.
Proposed paging procedure in Idle AHG Text
Proposal - contribution 1128r1
 Paging cycle and paging offset are proposed to be defined in terms
of super-frame.
 Paging offset is used to distribute paging load across different superframe.
 If multiple MSs are paged during a super-frame, Paged MSs will
initiate contention based CDMA ranging almost at the same time.
 Simultaneous UL access may collide and delay the network re-entry.
 Collision also introduces overhead because of re-attempts.
 According to C80216m-08/1128r1, paging indicators are transmitted
aligned with super-frame boundary (e.g. in BCH) while the full
paging messages is transmitted in either frame or sub-frame
(according to some hashing algorithm).
 According to C80216m-08/1128r1, multiple paging messages are
transmitted within super-frame to distribute the paging load and UL
contention based CDMA ranging load across frame/sub-frame.
 MS grouping could be based on MS MAC address or MS PGID.
Example paging procedure according to 1128r1
frame
Super-frame
Paging Indication
DL Sub-frame
Paging message
CDMA Ranging
UL Sub-frame
Issues:
 BS to broadcast multiple paging messages in frame or sub-frame
 MS has to wake up two times: first time at super-frame boundary to
get BCH and paging indicators and second time to get full paging
message at pre-determined frame or sub-sub-frame
 Transmission of multiple full paging messages introduces additional
overhead
proposal for 802.16m
• Transmit paging indicators and full paging message for
MSs at the beginning of the super-frame (either first or
sub-sequent sub-frame).
– Paging indicator and paging messages are transmitted at predetermined location.
– If BS can not broadcast full paging messages for the paged MSs
in first sub-frame, it can provide additional pointer for next
location.
• To achieve the distribution of UL contention based
ranging, MS will initiate the UL access based on hashing
algorithm (e.g. MAC address hashing or PGID hashing)
to select frame/sub-frame.
• If BS is part of multiple PG area, DL load balancing for
different paging group IDs can be achieved by having
different paging offset for different paging group IDs.
Illustration and Benefits of the proposal
frame
Super-frame
Paging Indication
DL Sub-frame
Paging message
CDMA Ranging
UL Sub-frame
• MS is require to wake up only at one time (at the beginning of super-frame), It
provide power saving.
• BS transmit only one paging message in one super-frame therefore reduces the
overhead.
• UL load distribution/balancing is achieved by distributing UL access in
different frame/sub-frame based on HASHING algorithm.
SDD Text proposal for Idle Mode AHG
C80216m-08/1128r1
[replace the text in section 10.x.2.1.2 with the following text]
10.x.2.1.2 BS Broadcast Paging message
Paging messages are transmitted in the beginning of super-frame at the pre-determined location during paging
listening interval.
Paging message includes identification of the MSs to be notified of DL traffic pending or location update.’
[replace the text in section 10.x.2.1.2 with the following text]
10.x.2.1.2.2 Operation during paging available interval
The MS derives the start of the paging listening interval based on the paging cycle and paging offset. At the
beginning of paging listening interval, the MS scans and synchronizes on the SCH of its preferred BS. The MS
decodes the BCH. The MS shall confirm whether it exists in the same Paging group as it has most recently
belonged by getting PG ID information.
During paging available interval, MS monitors the system broadcast information on the BCH.
Additionally, if paging indicators are present, MS also monitors the paging indicators. If the paging indicator
flag associated with its own PGID is set then MS will subsequently decode the full paging message at the
predetermined location otherwise MS will return to paging unavailable interval.
Paged MS perform the UL access in the frame/sub-frame determined by the hashing algorithm. The criteria of
selection frame/sub-frame for UL access is FFS.
If BCH indicates change in system broadcast information (e.g. change in system configuration count) then MS
should acquire the latest system broadcast information before MS return to paging unavailable interval.